WO2013114796A1 - ブロー成形装置 - Google Patents

ブロー成形装置 Download PDF

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Publication number
WO2013114796A1
WO2013114796A1 PCT/JP2013/000152 JP2013000152W WO2013114796A1 WO 2013114796 A1 WO2013114796 A1 WO 2013114796A1 JP 2013000152 W JP2013000152 W JP 2013000152W WO 2013114796 A1 WO2013114796 A1 WO 2013114796A1
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WO
WIPO (PCT)
Prior art keywords
liquid
rod
preform
seal
blow
Prior art date
Application number
PCT/JP2013/000152
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
澄人 佐藤
田村　信之
猛 永嶋
茂樹 森上
Original Assignee
株式会社吉野工業所
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2012019016A external-priority patent/JP5765657B2/ja
Priority claimed from JP2012123081A external-priority patent/JP5980576B2/ja
Application filed by 株式会社吉野工業所 filed Critical 株式会社吉野工業所
Priority to EP13743509.5A priority Critical patent/EP2810763B1/de
Priority to US14/376,053 priority patent/US9180621B2/en
Priority to CN201380013464.XA priority patent/CN104159722B/zh
Publication of WO2013114796A1 publication Critical patent/WO2013114796A1/ja

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/58—Blowing means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06—Injection blow-moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/4289—Valve constructions or configurations, e.g. arranged to reduce blowing fluid consumption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023—Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/46—Component parts, details or accessories; Auxiliary operations characterised by using particular environment or blow fluids other than air
    • B29C2049/4602—Blowing fluids
    • B29C2049/465—Blowing fluids being incompressible
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/58—Blowing means
    • B29C2049/5858—Distributing blowing fluid to the moulds, e.g. rotative distributor or special connection
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/78—Measuring, controlling or regulating
    • B29C49/786—Temperature
    • B29C2049/7866—Temperature of the blowing medium
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08—Biaxial stretching during blow-moulding
    • B29C49/10—Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12—Stretching rods
    • B29C49/121—Stretching rod configuration, e.g. geometry; Stretching rod material
    • B29C49/1216—Material for stretching rods or parts thereof, e.g. heat insulating material

Definitions

  • the present invention relates to a blow molding apparatus for a synthetic resin preform that uses a liquid as a pressurized fluid.
  • Blow-molded casings (so-called PET bottles) made of polyethylene terephthalate (PET) resin exhibit a number of excellent characteristics, and are therefore used in various fields as casing containers.
  • This type of container is generally molded by expanding and deforming a preform that has been injection-molded into a bottomed cylindrical shape in an expanded state in a state where the preform is heated to a temperature at which a stretching effect can be exhibited. .
  • the preform 31 heated to a temperature at which the stretching effect is exhibited is protruded upward from the mouth tube portion 32, and the mouth of the preform 31 is
  • the neck ring 33 integrally provided at the lower end of the outer peripheral surface of the cylindrical portion 32 is attached to the blow mold 101 while being locked to the neck support collar 103, and the guide cylindrical portion 110 which is the tip of the blow nozzle 104 is pushed.
  • the extension rod 108 inserted through the insertion hole 111 formed through the center of the blow nozzle 104, and pressurized fluid is passed through the insertion hole 111. Stretching in the radial direction by a certain blow air to achieve the molding into the casing 41.
  • Patent Document 2 describes an invention relating to a method of blow-molding a preform using a liquid instead of blow air as a pressurized fluid.
  • a liquid instead of blow air as a pressurized fluid.
  • the portion excluding the mouth tube portion of the preform is preheated to a temperature suitable for stretched blow molding, and the pressurized liquid is pressed. It is supplied into the reform and stretched into an expanded shape to shape the container, but in the case of liquid, heat conduction with the preform is greater than that of gas, and the temperature of the preform varies greatly depending on the temperature of this liquid. Therefore, it is necessary to control the temperature of the liquid supplied into the preform with high accuracy.
  • the temperature of the preform to be stretched changes depending on the temperature of the liquid, and the stretchability changes, resulting in variations in performance such as strength and heat resistance of the container. In some cases, sufficient formability cannot be obtained.
  • FIG. 13 is a schematic explanatory view of a conventional blow molding apparatus for blow-molding a preform using a liquid instead of blow air as a pressurized fluid.
  • the main part A of this apparatus has a mold 1 and a blow nozzle 104, and a pressurized liquid supply part 122 and a liquid circulation part 123 are arranged as accessory equipment for supplying a pressurized fluid adjacent to the main part A. is doing.
  • the pressurized liquid supply unit 122 is in the form of a plunger pump, which operates using a pressurized fluid Fp supplied from a pressurizing device 121 such as a pressurized pump or a compressor via a pipe P1 as a power source, and supplies pressurized liquid L.
  • a pressurizing device 121 such as a pressurized pump or a compressor
  • a pipe P1 as a power source
  • pressurized liquid L supplied through the pipe P2 and the electromagnetic valve V101, the blow nozzle 104 is supplied to the inside of the preform 31 that is closely fitted to the tip of the blow nozzle 104, and the preform 31 is expanded along the cavity shape of the mold 1.
  • the container 41 is shaped.
  • the liquid circulation device 123 circulates the liquid L through the pipe R102 and the pipe R103, and supplies the liquid L adjusted to a predetermined temperature to the pressurized liquid supply unit 122 while replenishing the liquid L from the pipe R101.
  • the pressurized liquid L is supplied to the inside of the preform 31 through the pipe P2 and the blow nozzle 104 as described above, the temperature depends on the room temperature at the site where the apparatus is arranged and the number of molding shots. It changes by many factors such as.
  • Blow molding includes (1) a step of setting the preform 31 on the mold 1, (2) a step of fitting the blow nozzle 104 into the mouth tube portion 32 of the preform 31, and (3) a pressurized liquid L To the inside of the preform 31 through the blow nozzle 104 to shape the container 41, (4) to detach the blow nozzle 104 from the mouth tube portion 32 of the preform 31, and (5) mold
  • the liquid L is introduced into the blow nozzle for the first time in the step (3) and immediately into the preform 31 or the container 41.
  • maintaining the temperature of the liquid L supplied to the inside of the preform 31 to be constant is a difficult technical matter in actual production.
  • the present invention is a blow molding apparatus that uses a liquid as a pressurized fluid, and it is a technical problem to accurately control the temperature of the liquid supplied into the preform in order to stretch the preform in an expanded state. To do.
  • the main configuration of the present invention for solving the above-described problems is that a blow molding die and a blow nozzle that fits closely to a preformed tubular portion in a state where a bottomed cylindrical preform is mounted on the die.
  • a pressurized liquid supply unit is disposed, and the liquid pressurized from the pressurized liquid supply unit is supplied into the preform through the blow nozzle and expanded along the cavity of the mold.
  • a valve mechanism is arranged at the downstream end of a liquid supply path in a blow nozzle so that the supply path can be opened and closed. The liquid can be circulated by the pressurized liquid supply unit, and the pressurized liquid can be supplied into the preform through the supply path in the open state.
  • the pressurized liquid is supplied to the preform through the supply path.
  • the liquid used as the pressurized fluid is circulated between the supply path and the pressurized liquid supply part at all times or as required.
  • the temperature of the liquid supplied into the preform for shaping the container can be controlled with high accuracy, and the shaping of the container can be achieved stably under a certain temperature condition.
  • the above-described problems such as variations in performance such as strength and heat resistance of the container, and insufficient shapeability can be effectively solved without impairing productivity.
  • the valve mechanism at the downstream end portion of the supply path communicating with the preform formed in the blow nozzle, the temperature is circulated through most of the liquid staying in the supply path.
  • the temperature of the liquid can be adjusted and can be maintained at a predetermined temperature with high accuracy.
  • the pressurized liquid supply unit is provided with a liquid circulation unit that supplies a liquid by adjusting to a predetermined temperature, and the supply path is upstream of the supply path of the blow nozzle.
  • the pressurizing liquid supply unit is openably and closably communicated via an introduction path disposed at the side end, and the liquid is openable and closable via a discharge path disposed at an upstream position of the valve mechanism at the downstream end. It is configured to communicate with the circulation unit, and in a closed state of the valve mechanism, the liquid circulation unit is configured to allow liquid circulation between the supply channel and the pressurized liquid supply unit.
  • the present invention relates to a configuration for circulating a liquid between pressurized liquid supply units.
  • a rod-shaped seal body is inserted and disposed in the blow nozzle so as to be movable in the axial direction of the blow nozzle.
  • the supply path can be closed by contact with a seal step disposed on the inner peripheral surface, and the valve mechanism is configured by contacting and uncontacting the tip of the seal body with the seal step. It constitutes that.
  • the above configuration relates to a valve mechanism that opens and closes the supply path in the blow nozzle.
  • the supply path can be easily opened and closed by moving the stick-shaped sealing body that is inserted and movably inserted in the axial direction of the blow nozzle. can do.
  • Still another configuration of the present invention is that, in the above configuration, a rod is slidably inserted into a cylindrical rod-shaped shaft body in a liquid-tight manner to form a seal body.
  • the rod that is slidably inserted into the rod-shaped shaft body in a liquid-tight manner can be moved in a mode different from the movement operation of the shaft body, and this rod was used as a pressurized fluid for blow molding.
  • a head space in a container filled with a liquid as a product simultaneously with shaping can be used as a member for controlling the head space to a predetermined amount. It can also be used as a stretching rod for longitudinally stretching a preform.
  • Still another configuration of the present invention is the above configuration, wherein the rod is configured as a stretching rod for longitudinally stretching the preform, and a cylindrical rod-shaped shaft body is inserted and disposed along the axial direction in the blow nozzle.
  • a cylindrical rod guide is connected coaxially to the lower end of the shaft body, the extending rod is inserted into the connected shaft body and the rod guide, and the extending rod is slidably connected to the rod guide.
  • the shaft body, the rod guide, and the extending rod constitute the seal body, and the cylindrical liquid supply path is formed on the inner peripheral surface of the blow nozzle and the outer peripheral surface of the seal body,
  • the valve mechanism When the valve mechanism is closed, the rod guide is fitted into the reduced diameter portion immediately below the seal step portion of the blow nozzle, and when the valve mechanism is opened, the rod guide is configured to be fitted and removed upward from the reduced diameter portion. It is said.
  • a shaft body and a stretching rod in which a metal material is used are configured such that the stretching rod is slidably inserted into a rod guide connected to the lower end of the shaft body.
  • the rod guide can be formed in a short cylindrical shape, and the sliding area can be smoothly achieved by reducing the circumferential contact area with the extending rod and reducing the sliding resistance of the extending rod.
  • the rod guide is fitted in the reduced diameter portion directly below the seal step, that is, the rod guide is supported by the peripheral wall of the reduced diameter portion of the blow nozzle.
  • the function of supporting the posture of the stretched rod by the reduced diameter portion is sufficiently exhibited through the rod guide, and together with the effect of suppressing the core blur of the stretched rod, the stretched rod.
  • the valve mechanism is opened to bring the rod guide into a state of being removed from the reduced diameter portion immediately below the seal step portion, and the inside of the blow nozzle.
  • the above-mentioned rod which is formed by the peripheral surface and the outer peripheral surface of the stretching rod, can form a liquid flow path communicating with the inside of the preform without a notch and having a sufficient flow path area.
  • the container can be shaped in a stable state and with high productivity.
  • the rod guide is made of polyetheretherketone (PEEK) resin.
  • the rod guide has the function of suppressing the core blur of the drawn rod, and the drawn rod using metal is inserted in a circumferential shape and repeatedly slides at high speed, so heat resistance, durability, wear resistance It is a member that is required to have high performance and slipperiness, and can be appropriately selected from engineering plastics or so-called super engineering plastics in consideration of food hygiene and the like depending on the application.
  • PEEK resin which is one of super engineering plastics, is a material that can sufficiently exhibit these performances, and is a material suitable for a rod guide.
  • rod guides include engineering plastics such as polyamide resin, polyacetal resin, polybutylene terephthalate resin, super engineering plastics such as polysulfone (PSF) resin, polyimide (PI) resin, polyphenylene sulfide. (PPS) resin etc. can be mentioned.
  • engineering plastics such as polyamide resin, polyacetal resin, polybutylene terephthalate resin
  • super engineering plastics such as polysulfone (PSF) resin, polyimide (PI) resin, polyphenylene sulfide. (PPS) resin etc. can be mentioned.
  • the lower end portion of the shaft body is configured by fitting and assembling a short cylindrical seal cylinder piece into an enlarged coaxial coaxial shape, and a peripheral edge portion of the seal cylinder piece Is in contact with the seal step, and the rod guide is connected to the lower end of the seal cylinder piece in a reduced diameter.
  • the diameter of the lower end portion of the shaft body can be largely adjusted by configuring the lower end portion of the shaft body with a short cylindrical seal cylinder piece having an enlarged coaxial core shape.
  • the degree of freedom in designing the structure can be increased, and the sealing function can be sufficiently exhibited.
  • the diameter of the lower end portion of the shaft body the diameter of the rod guide and the diameter of the reduced diameter portion can be increased correspondingly, increasing the degree of freedom in designing the liquid flow path depending on the purpose of use. It becomes possible to do.
  • an insertion cylinder piece to be fitted into the preform tube portion is disposed at the lower end portion of the blow nozzle, and the outer peripheral wall of the insertion cylinder piece is compressed toward the tip. It is said that a peripheral step portion having a diameter is provided around and the blow nozzle is in close communication with the mouth tube portion by contacting the peripheral step portion and the upper end surface of the mouth tube portion via a seal member. is there.
  • the above configuration relates to a sealing method for tightly communicating the blow nozzle with the mouth tube portion, but the above configuration can reliably maintain the sealing performance with a simple configuration, and the mounting of the preform, Demounting can also be performed at high speed, and maintenance management including replacement of the seal member can be easily performed.
  • the configuration related to the sealing method is merely an example, and an appropriate sealing method can be employed in consideration of sealing performance, productivity, and the like.
  • the blow molding apparatus of the present invention has the above-described configuration, and according to the apparatus having the main configuration of the present invention, the process from setting the preform to the mold leads to the process of removing the molded container from the mold.
  • the liquid used as the pressurized fluid is always used in the other processes except the process of supplying the pressurized liquid to the inside of the preform through the supply path and shaping the container, or If necessary, it can be circulated between the supply path and the pressurized liquid supply unit to adjust to a predetermined temperature, and the temperature of the liquid supplied into the preform for shaping the container can be controlled with high accuracy. It is possible to stably achieve the shaping of the container under a certain temperature condition, causing variations in performance such as the strength and heat resistance of the container, and insufficient shaping properties. , Without losing productivity It can be solved in.
  • FIG. 1 It is a schematic explanatory drawing which shows an example of the whole structure of the blow molding apparatus which is 1st Embodiment of this invention. It is sectional drawing to which the lower half part of the main part of the apparatus of FIG. 1 was expanded. It is sectional drawing which shows the state which extended the preform in the expanded state with the pressurized liquid among the shaping
  • FIG. 1 It is a schematic explanatory drawing which shows an example of the whole structure of the blow molding apparatus which is 1st Embodiment of this invention. It is sectional drawing to which the lower half part of the main part of the apparatus of FIG. 1
  • FIG. 7 is a cross-sectional view showing a state in which the preform is longitudinally stretched with a stretching rod from the state of FIG.
  • FIG. 8 is a cross-sectional view showing a state immediately before completing the shaping of the container in the step of extending the preform in an expanded state with the pressurized liquid from the state of FIG. 7 in the forming step by the apparatus of FIG. 5.
  • FIGS. 1 and 2 are for explaining an embodiment of the blow molding apparatus of the present invention and for explaining a blow molding method using this apparatus.
  • FIGS. 1 and 2 are for explaining an embodiment of the blow molding apparatus of the present invention and for explaining a blow molding method using this apparatus.
  • FIG. 1 is a schematic explanatory view showing an example of the overall configuration of the blow molding apparatus of the present invention
  • FIG. 1 is an enlarged cross-sectional view of the lower half of the main part of the apparatus shown in a vertical cross section
  • FIG. 1 is a schematic explanatory view showing an example of the overall configuration of the blow molding apparatus of the present invention
  • FIG. 1 is an enlarged cross-sectional view of the lower half of the main part of the apparatus shown in a vertical cross section
  • FIG. 1 shows a state in which the preform 31 is mounted on the mold 1 and the tip of the blow nozzle 4 is fitted into the mouth tube portion 32 of the preform 31.
  • the shape of the preform 31 to be used is a bottomed cylindrical test tube as a whole, and a mouth tube portion 32 is erected at the upper end portion, and a neck ring 33 is disposed at the lower end portion of the mouth tube portion 32,
  • the mouth tube portion 32 is mounted in the mold 1 in a state of protruding outward (upward in FIGS. 1 and 2).
  • the main part of this apparatus has a mold 1, a partition member 11, and a blow nozzle 4, and a pressurizing device 21, a pressurized liquid supply unit 22, and a liquid circulation unit 23 are arranged as accessory equipment.
  • the partition wall member 11 is disposed above the mold 1 so as to surround the outer peripheral surface of the mouth tube portion 32 of the preform 31 protruding above the mold 1 through the space S.
  • the partition wall member 11 is provided with a vent hole 13 for supplying pressurized gas to the space S as required.
  • the support rod 12 provided around the lower end of the partition wall member 11 is brought into close contact with the neck ring 33 of the preform 31 from above to maintain the mounting posture of the preform 31.
  • the blow nozzle 4 has a tubular shape as a whole, and is composed of an insertion tube piece 5 and a supply tube portion 6 which are closely connected by a seal member 7b.
  • the fitting cylinder piece 5 has a cylindrical hollow portion inside, and as shown in FIG. 2, a circumferential step portion 5a having a diameter decreasing toward the tip is provided on the outer peripheral wall, and the cylindrical tip is provided. Is inserted into the mouth tube portion 32 of the preform 31, and the blow nozzle 4 and the mouth tube portion 32 are brought into contact with each other via the seal member (O-ring) 7 a on the upper end surface of the peripheral step portion 5 a and the mouth tube portion 32. They are connected in close communication.
  • the supply cylinder portion 6 is a member having a hollow cylindrical portion as a whole, and as shown in FIG. 1, an introduction path 6a for the liquid L is disposed through the peripheral wall at the upper end portion, and the lower end portion. In the vicinity, a discharge path 6b for the liquid L is also provided penetrating the peripheral wall. Further, a seal step 6s inclined downward in a reduced diameter is provided on the inner peripheral surface of the lower end portion of the supply cylinder portion 6 further below the discharge passage 6b. Further, a vent hole 6c for communicating the outside and the inside of the supply cylinder portion 6 is disposed under the seal step portion 6s.
  • a rod-like seal body (seal pin) 9 elongated in the axial direction (vertical direction in FIG. 1) is inserted into the blow nozzle 4 constituted by the fitting cylinder piece 5 and the supply cylinder portion 6 as described above. It is arranged.
  • the seal body 9 is formed by inserting an elongated cylindrical rod 8 into a slender cylindrical rod-shaped shaft body 9a so as to be slidable in a liquid-tight manner, and a short cylindrical shape is formed at the tip of the shaft body 9a.
  • the seal cylinder piece 9t is fitted and assembled coaxially. And the outer peripheral edge part of the lower end surface of this seal cylinder piece 9t is rounded off, and becomes the taper edge part 9ta.
  • the blow nozzle 4 and the seal body 9 form a cylindrical supply path Fs communicating with the preform 31 along the axial direction of the blow nozzle 4 in the blow nozzle 4, and the seal body 9 is lowered.
  • the taper edge 9ta of the seal tube piece 9t abuts on the seal step 6s provided on the inner peripheral surface of the lower end portion of the supply tube portion 6 as shown in FIGS.
  • the inside of the preform can be closed, and the seal body 9 can be opened by moving upwardly as shown in FIG. 3, and the seal step portion of the taper edge 9ta can be opened.
  • the valve mechanism Vm is configured by the contact and disengagement with 6s.
  • the introduction path 6a described above is positioned at the upstream end of the supply path Fs
  • the discharge path 6b is positioned at the downstream end of the supply path Fs and immediately upstream of the seal step 6s.
  • the rod 8 is for exhibiting a function of controlling the head space in a container filled with a liquid L used as a pressurized fluid for blow molding at the same time as a product as described later to a predetermined amount. Further, the rod 8 can be used as a stretching rod for longitudinally stretching the preform 31.
  • the pressurizing device 21 is conventionally an indispensable facility in blow molding, A large-scale facility such as a pressure pump or a compressor, and a pressurized fluid supply in the form of a plunger pump that supplies pressurized liquid L to the pressurized fluid Fp supplied from the pressure device 21 via the pipe P1. It becomes a power source of the part 22.
  • the pressurized liquid supply unit 22 may be a cylinder with a built-in piston having two chambers in addition to a pump-like one such as a plunger shown in the figure.
  • the liquid circulation unit 23 adjusts the liquid L to a predetermined temperature while adjusting the liquid L to a predetermined temperature while replenishing the liquid L from the pipe R1 and supplying the liquid L to the pressurized liquid supply unit 22 through the pipe R2.
  • it has a function of circulating between the pressurized liquid supply unit 22 and the supply path Fs in the blow nozzle 4. That is, as necessary, the liquid L is referred to as supply path Fs ⁇ discharge path 6b ⁇ pipe R3 ⁇ liquid circulation part 23 ⁇ pipe R2 ⁇ pressurized liquid supply part 22 ⁇ pipe P2 ⁇ introduction path 6a ⁇ supply path Fs.
  • the configured circuit CR can be circulated.
  • the circulation path CR is provided with a number of valves for opening and closing the flow paths as needed along the blow molding process.
  • FIG. 1 four electromagnetic valves V1, V2, V3 and V4 are shown.
  • blow molding a method for manufacturing a synthetic resin container using the blow molding apparatus described above, that is, a blow molding method will be described with reference to FIGS.
  • blow molding the steps described in the following (1) to (6) are sequentially performed.
  • a preform 31 in which a portion excluding the mouth tube portion 32 is heated to a temperature suitable for blow molding is attached to the mold 1 for blow molding with the mouth tube portion 32 protruding upward, Clamp the mold.
  • the seal cylinder piece 9t is moved up and displaced from the state of FIG. 1 along with the shaft body 9a constituting the seal body 9 to open the valve mechanism Vm, and the valves V1, V2 and V3 are closed, the circulation of the liquid L along the circulation path CR is stopped, the pressurized function of the pressurized liquid supply unit 22 is operated, and the pressurized liquid L is supplied from the supply path Fs to the mouth tube portion 32.
  • the preform 31 is supplied into the preform 31, the preform 31 is expanded in an expanded state, and the container 41 is shaped along the cavity 2 of the mold 1.
  • FIGS. 5 to 11 are for explaining a blow molding apparatus according to a second embodiment of the present invention and a method for producing a synthetic resin container using this apparatus.
  • the present invention will be mainly described with reference to FIGS.
  • An example of the overall configuration of the blow molding apparatus according to the second embodiment will be described, and an example of a method for producing a synthetic resin container using this apparatus will be described with reference to FIGS. 5 to 10, that is, a blow molding method using a liquid as a pressure medium.
  • FIGS. 5 to 11 members corresponding to those described above are denoted by the same reference numerals, and description thereof is omitted.
  • the fitting cylinder piece 5 is formed in a shape such that the upper part is a tapered cylinder and the lower part is a cylinder. Further, a diameter-reduced portion 6d having a smaller diameter than the portion immediately above the seal step portion 6s of the supply cylinder portion 6 is provided. Furthermore, the rod 8 is configured as a stretching rod 8.
  • the seal body 9 includes an elongated cylindrical rod-shaped metallic shaft body 9a configured by fitting a short cylindrical seal tube piece 9t coaxially with a lower end portion; An elongated rod-shaped extending rod 8 is inserted through a cylindrical rod guide 9g connected to the lower end of the seal tube piece 9t in a cylindrical axis shape.
  • the lower end portion of the shaft body 9a is configured by a short cylindrical seal tube piece 9t fitted and assembled coaxially.
  • the extending rod 8 is inserted into the shaft body 9a through a slight gap, while the rod guide 9g is slidably surrounded by the extending rod 8. It is configured to be inserted in a tangential shape.
  • the extending rod 8 is slidably inserted into the upper rod guide 6tg at the upper end portion of the supply cylinder portion 6 (see FIG. 5).
  • the rod guide 9g is arranged so that it can be slidably inserted into and removed from the reduced diameter portion 6d.
  • the rod guide 9g is inserted into or removed from the sliding state in a state where the extending rod 8 is inserted in a circumferential manner and repeatedly slid at a high speed and is in circumferential contact with the reduced diameter portion 6d.
  • the rod guide 9g is made of polyetheretherketone (PEEK) resin from the viewpoint of heat resistance, durability, wear resistance, and slipperiness.
  • PEEK polyetheretherketone
  • an appropriate synthetic resin can be selected from other engineering plastics and super engineering plastics in consideration of usage conditions and the like.
  • the seal cylinder piece 9t and the rod guide 9g can be firmly joined in an undercut shape by injection molding of the rod guide 9g using the seal cylinder piece 9t as an insert material.
  • the rod guide 9g In the closed state of the valve mechanism Vm, the rod guide 9g is fitted into the reduced diameter portion 6d immediately below the seal step 6s of the nozzle guide 4, and in the opened state of the valve mechanism Vm, the rod guide 9g is reduced. 6d, the liquid L is opened and the flow path of the liquid L is opened.
  • the stretching rod 8 and the shaft body 9a are both parts that use metal, and the stretching rod 8 and the shaft body 9a are both prevented from being worn or the relative movement between them can be achieved smoothly.
  • the extending rod 8 is slidably inserted into the rod guide 9g so that the rod guide 9g can be seen when the valve mechanism Vm is open as shown in FIG. Is not supported by the reduced diameter portion 6d with respect to the rod guide 9g, but is caused by at least the gap between the extending rod 8 and the shaft body 9a including the seal cylinder piece 9t.
  • the core blur of the extending rod 8 can be suppressed.
  • the rod guide 9g is fitted into the reduced diameter portion 6d immediately below the seal step 6s, that is, the rod guide 9g is connected to the reduced diameter portion 6d of the blow nozzle 4. It can be in a state of being supported by the peripheral wall, and the function of supporting the posture of the extending rod 8 by the reduced diameter portion 6d is sufficiently exerted through the rod guide 9g.
  • the core of the extending rod 8 by the rod guide 9g described above Combined with the effect of suppressing blurring, the longitudinal stretching of the preform by the stretching rod 8 can be performed uniformly without blurring or so-called misalignment.
  • FIGS. 6 7 and 8 are enlarged sectional views of the lower half of the main part of the apparatus.
  • blow molding the steps described in the following (1) to (7) are sequentially performed.
  • a preform 31 in which a portion excluding the mouth tube portion 32 is heated to a temperature suitable for blow molding is attached to the mold 1 for blow molding with the mouth tube portion 32 protruding upward, Clamp the mold.
  • the taper edge portion 9ta of the seal tube piece 9t constituting the lower end portion of the seal body 9 is in contact with the seal step portion 6s of the supply tube portion 6, so that the valve mechanism Vm is in a closed state and stretched.
  • the rod 8 is inserted into the preform 31.
  • the rod guide 9g is fitted into the reduced diameter portion 6d immediately below the seal step portion 6s of the nozzle guide 4.
  • the valves V1, V2, and V3 are all opened, and the liquid L circulates in the above-described circulation path CR while the temperature of the liquid L is adjusted by the liquid circulation unit 23.
  • the preform 31 is longitudinally stretched by the stretching rod 8, and the central portion of the bottom wall 35 of the preform 31 is connected to the lower end portion of the stretching rod 8 and the gold.
  • the mold 1 is sandwiched between the bottom walls 1b.
  • the orientation of the stretching rod 8 is reliably supported by the upper rod guide 6tg located at the upper portion and the rod guide 9g supported by the reduced diameter portion 6d. It can be carried out uniformly without blurring and misalignment.
  • the stretching rod 8 is configured to vertically stretch until the bottom wall 35 of the preform 31 comes into contact with the bottom wall 1b of the mold.
  • productivity of blow molding and the meat of the container to be molded are In consideration of the thickness distribution and the like, it may be configured to be longitudinally stretched to an intermediate height.
  • the container 41 is in a state immediately before completion of shaping so that a gap is seen between the surface of the cavity 2 near the shoulder portion 43 and the bottom portion 45. In this state, it is in loose contact with the cavity 2 surface.
  • the supply flow path for the liquid L to the inside of the preform 31 can be a cylindrical flow path having a smooth and sufficient flow path area.
  • the pressurizing time inside the preform by the liquid L can be shortened as compared with the conventional apparatus, and the production speed can be increased.
  • the pressurization time of the preform 31 by the pressurized liquid L is 334.23 msec, and the flow path Fc is notched as shown in FIG. It was confirmed that the pressurization time can be greatly shortened compared to 433.17 ms when the formed rod guide 104g is disposed inside the mouth tube portion 32 of the preform 31.
  • the cylindrical smooth flow path has no notches, the problems related to the generation of bubbles could be solved.
  • the pressurized liquid L is filled in the container 41 by the amount that the stretching rod 8 is raised in accordance with the pulling up operation of the stretching rod 8, the volume of the container 41 is reduced as the stretching rod 8 is pulled up. While preventing deformation, the shaping of the container 41 along the cavity 2 of the mold 1 is completed as shown in FIG. 9, and the peripheral wall of the container 41 is pressed against the surface of the cavity 2 with the pressurized liquid L, Holding pressure and cooling are possible.
  • valve mechanism Vm for stopping the supply of the liquid L is disposed in the vicinity of the lower end portion of the blow nozzle 4, from the position where the valve mechanism Vm is disposed.
  • the amount of the liquid L remaining in the supply path Fs portion over the upper end of the preform tube portion can be reduced and measured with high accuracy, and the head space Hs can be controlled with higher accuracy.
  • the conventional apparatus shown in FIG. 13 since the supply of the liquid L is stopped by the valve V101 disposed outside the blow nozzle 104, it is difficult to control the head space with high accuracy.
  • valve mechanism Vm is configured by contacting and detaching the tapered edge portion 9ta with the seal step portion 6s.
  • various types of valve mechanisms can be employed.
  • the rod 8 is used to adjust the head space Hs of the filling liquid in the container 41, but a configuration without the rod 8 may be used depending on the purpose of use.
  • the timing of pulling up the lower end of the stretching rod 8 from the position after the longitudinal stretching until reaching a predetermined height position inside the container is shaped by the container 41 shown in FIG. Although it is immediately before completion, during the shaping of the container by expansion of the pressurized liquid L, when the shaping is completed, especially after a predetermined time after the shaping is completed, etc. Instead, it can be determined appropriately in consideration of blow moldability including productivity, presence / absence of volumetric deformation, presence / absence of residual strain in the molded container, uniformity of the peripheral wall, and the like.
  • the longitudinal stretching by the stretching rod 8 is performed, and then the pressurized liquid L is supplied into the preform 31 with the valve mechanism Vm opened.
  • the supply of the pressurized liquid L into the preform 31 can be performed together with the longitudinal stretching by the stretching rod 8.
  • the valve V3 and the valve V1 are closed from the state shown in FIG. 6, the shaft body 9a is raised to open the valve mechanism Vm, and the longitudinally pressurized and stretched liquid L is drawn by the stretching rod 8.
  • the feed into the preform 31 is simultaneously performed and the longitudinal stretching is completed.
  • the rod guide 9g is longitudinally stretched in a state where the rod guide 9g is removed from the reduced-diameter portion 6d, but as described above, the reduced-diameter portion 6d with respect to the rod guide 9g is used. Although there is no support, at least the core blur of the extending rod 8 can be suppressed by the effect of the rod guide 9g.
  • the blow molding apparatus using the pressurized liquid according to the present invention can control the temperature of the liquid supplied into the preform with high accuracy without impairing the productivity. From the viewpoint of improving the quality of containers and improving productivity, it is expected that they will be widely used in the field of blow molding using pressurized liquid.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
PCT/JP2013/000152 2012-01-31 2013-01-16 ブロー成形装置 WO2013114796A1 (ja)

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EP13743509.5A EP2810763B1 (de) 2012-01-31 2013-01-16 Blasformvorrichtung
US14/376,053 US9180621B2 (en) 2012-01-31 2013-01-16 Blow molding device
CN201380013464.XA CN104159722B (zh) 2012-01-31 2013-01-16 吹塑装置

Applications Claiming Priority (4)

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JP2012019016A JP5765657B2 (ja) 2012-01-31 2012-01-31 ブロー成形装置
JP2012-019016 2012-01-31
JP2012-123081 2012-05-30
JP2012123081A JP5980576B2 (ja) 2012-05-30 2012-05-30 ブロー成形装置

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EP2883800A1 (de) * 2013-12-13 2015-06-17 Discma AG Kolbenvorrichtung mit einem Ventil zur Regelung des Einlasses der Kolbenvorrichtung
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JP6333577B2 (ja) 2014-02-28 2018-05-30 株式会社吉野工業所 ブロー成形装置
EP2987606B1 (de) * 2014-08-20 2020-03-18 Krones AG Verfahren zum Ausformen und Füllen von Behältern und Formfüllmaschine
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JP6555915B2 (ja) * 2015-03-31 2019-08-07 株式会社吉野工業所 液体ブロー成形装置
JP6396844B2 (ja) * 2015-04-30 2018-09-26 株式会社吉野工業所 液体ブロー成形装置
JP6450641B2 (ja) * 2015-04-30 2019-01-09 株式会社吉野工業所 液体ブロー成形装置および液体ブロー成形方法
JP6739159B2 (ja) 2015-10-29 2020-08-12 株式会社吉野工業所 合成樹脂製容器およびその製造方法
WO2017086915A1 (en) * 2015-11-16 2017-05-26 Discma Ag Method of forming a container using a liquid
JP6685705B2 (ja) * 2015-11-27 2020-04-22 株式会社吉野工業所 液体ブロー成形方法及び液体ブロー成形装置
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JP7090980B2 (ja) * 2018-01-31 2022-06-27 株式会社吉野工業所 液体ブロー成形装置
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WO2015045253A1 (ja) * 2013-09-30 2015-04-02 株式会社吉野工業所 ブロー成形装置
CN105473306A (zh) * 2013-09-30 2016-04-06 株式会社吉野工业所 吹塑成型装置
US9713899B2 (en) 2013-09-30 2017-07-25 Discma Ag Blow molding device
EP2883800A1 (de) * 2013-12-13 2015-06-17 Discma AG Kolbenvorrichtung mit einem Ventil zur Regelung des Einlasses der Kolbenvorrichtung
WO2015086707A1 (en) * 2013-12-13 2015-06-18 Discma Ag Piston device comprising a valve controlling the inlet of the piston device
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US10166712B2 (en) 2013-12-16 2019-01-01 Discma Ag Method and apparatus for fabricating containers
CN106103043A (zh) * 2014-03-10 2016-11-09 帝斯克玛股份有限公司 形成及设定容器内的顶部空间的方法
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CN106103043B (zh) * 2014-03-10 2019-12-31 帝斯克玛股份有限公司 形成及设定容器内的顶部空间的方法
CN109476065A (zh) * 2016-06-30 2019-03-15 株式会社吉野工业所 液体吹塑成形装置
CN109476065B (zh) * 2016-06-30 2021-01-08 株式会社吉野工业所 液体吹塑成形装置

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CN104159722B (zh) 2016-08-17
EP2810763B1 (de) 2018-03-07
US20140356475A1 (en) 2014-12-04
US9180621B2 (en) 2015-11-10
EP2810763A4 (de) 2015-10-28
CN104159722A (zh) 2014-11-19
EP2810763A1 (de) 2014-12-10

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